(كوسه ها و سپرماهيان) (sharks and rays) >
Rajiformes (Skates and rays) >
Rajidae (Skates)
Etymology: Rajella: Latin, raja, -ae = a sting ray (Raja sp.) (Ref. 45335).
Eponymy: Dr Keppel Harcourt Barnard (1887–1964) was a UK-born South African invertebrate zoologist particularly interested in marine crustaceans. [...] (Ref. 128868), visit book page.
More on author: Norman.
محیط زیست: محیط زیست / منطقه آب و هوایی / تغييرات عمق / محدوده توزیع
بوم شناسي
دريايي موجوداتی که در اعماق زیر 200 متر زندگی و تغذیه می کنند; تغييرات عمق 102 - 1207 m (Ref. 106604). Deep-water
Eastern Atlantic: off Mauritania to South Africa, probably throughout on the deep, middle and upper slope, even on outer shelf of Namibia and South Africa.
اندازه / وزن / سن
بلوغ: Lm ?  range ? - ? cm
Max length : 75.0 cm TL جنس نر / بدون خواص جنسي; (Ref. 106604)
Found on the outer shelf and upper slope (Ref. 5578). Feeds on small crustaceans, squid and polychaete worms (Ref. 5578). Oviparous (Ref. 50449). Eggs have horn-like projections on the shell (Ref. 205). Taken by hake trawlers (Ref. 5578).
چرخه زندگی و رفتار جفتگیری
بلوغ | تولید مثل | تخم ریزی | تخم ها | باروری | توزاد ( لارو)
Oviparous, paired eggs are laid. Embryos feed solely on yolk (Ref. 50449).
McEachran, J.D. and K.A. Dunn, 1998. Phylogenetic analysis of skates, a morphologically conservative clade of elasmobranchs (Chondrichthyes: Rajidae). Copeia 1998(2):271-290. (Ref. 27314)
وضعيت در فهرست قرمز IUCN (Ref. 130435: Version 2025-2 (Global))
خطر برای انسان ها
Harmless
استفاده انسانی
ماهي گيري – شيلات: bycatch
ابزارها
گزارش های ويژه
بارگيری XML
منابع اينترنتي
تخمینها بر اساس مدلها
شاخص تنوع فیلوژنتیکی (مرجع 82804) |
PD50 = 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high]. |
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Bayesian length-weight
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a=0.00331 (0.00199 - 0.00551), b=3.21 (3.07 - 3.35), in cm total length, based on LWR estimates for this species & (Sub)family-body (Ref. 93245). |
سطح تروفیک (مرجع 69278) |
3.5 ±0.43 se; based on food items. |
جهندگی (مرجع 120179) |
پايين ، كم, كمينه زمان لازم براي دو برابر شدن جمعيت 5/4 – 14 سال (Fec assumed to be <100). |
آسیبپذیری ماهیگیری (Ref. 59153) |
Moderate to high vulnerability (53 of 100). 🛈 |
طبقه قيمت (Ref. 80766) |
Medium.
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مواد مغذی (Ref. 124155) |
Calcium = 9.41 [1.70, 47.02] mg/100g; Iron = 0.362 [0.086, 1.105] mg/100g; Protein = 16.6 [13.7, 19.2] %; Omega3 = 0.615 [0.183, 2.451] g/100g; Selenium = 15 [4, 49] μg/100g; VitaminA = 7.58 [1.88, 30.92] μg/100g; Zinc = 0.34 [0.17, 0.63] mg/100g (wet weight); |